Friday, January 14, 2011

Paragliders: let you fly in the sky

Paragliders mainly by fluctuation two canopy, use among similar wing profile shapes of wing shape compartment connections. Another sling tightly, manipulate the rope and manipulate brought together. An umbrella YiChang (wing picture) about 9 ~ 11 meters, width (wing string) about 3 meters, the weight of the whole paragliders approximately 4 ~ 6 kg or so. 
Paragliders edge of to make air flows into, opened a draught. Edge is completely sealed, so that air trapped in the upper and lower two can canopy in. Airfoil compartment is keep good shape can fly the main factor.
Along the wing of direction, general intervals of 30 to 50 centimeters a cubicle. If compartment, to keep the ideal number increased the airfoil is good, but actually increased the umbrella in weight and in making also more troublesome.
In addition, every piece of compartment still on the open several sizes, to ensure the blowhole canopy internal air circulation and pressure balance. When in case there are several tuyere cannot normal opened, the other compartments within the air will through compartment of the blowhole will air into, make the canopy shape remained normal. 
Paragliders flight principle: to the paragliders glides, aloft, climb, the main principle is the basis of physics "miss PASCAL law" a velocity varies inversely with the pressure. Also is the rapid flow of low pressure, velocity of slow pressure will be large.
Although different because of different airfoil paragliders arising from the lift is different, but their common characteristic is, The upper wing than lower long, when the air by front is divided into fluctuation two parts, flows through the upper air fast speed, the pressure generated lesser, flows through a layer of air velocity slow, the pressure generated is bigger.
Stressful side pressure small side to push, resulting in buoyancy, make fly through the air entrapped, gliding and climb. 

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